Bolt-cutting machine.



F. A. GILLETTE.

BOLT CUTTING MACHINE.

APPLIOA'I'IOE mum 3.5. 1010.

Patented'Apr'. 9, 1912.

a aux-2x 2112212 1.

F. A. G LLETTE; BOLT OUTTIHG ILUHIHB APPLIUL'HOI FILED [13.5, 1910.

- V 3 SHEETS-SHEET 2.

1 v F. A. GILLETTE.

BOLT CUTTING MACHINE. minim-r101; mum n11. sjmu.

Patented Apr. 9, 1912.

3 BH-BETB4HEST 8.

Flinn IK Lmo. vasmnsmmb c .a citizen'o f the United States, resi Philadelphia, Pennsylvania, ce a chines, of which the followingis 11:.SPGQ1fiGii i 1 i' as earih s a re impr e f'merits; Iin bolt cutting machines, i 10.

UNITE OFFICE.

a Grahams; as; raansnvama .To all rbhom tt may Be iai nowa that Improvements Bolt-Cutting,. Ma

.tion. v l -My.invention relates. tjflcertain e pw lg machines. for cutting sta bolts, in Whi "there isa screw thread at each object ofmy .struet. the cutter that it Fig. 5,- is a sectional -has openings b b Iatta'in in the the accompanying draw s, 1. p p g I l th rw ich will cause the cutters E to invention. is to"s:o coir.

on the bolt simultaneously with the reducing ofithe. central portion'thereoi; object, following manner, reference beingl had to' inlw ich:-

ing my improved stay bolt cutting machine;

Fig. 2, is a plan view of the cutter head; .,Fig.-3, is a side View of the cutter headgFig; r

4, 1s a sectional view on the line 4-4 Fig. 2; Ian view on the line 5 5 Fig. 3, showing t e carriers for the cutters; Fig. 6, is a section on the line 6-6 Fi 2; Fig. 7, is a view of the stay bolt= blanfi, and Fig. 8, bolt. I

A is the base frame of the bolt cutting machine, and A is the top frame.

a-a are two vertical guides on which slides the cutter head B. This cutter head at each side through which extend the guides a-a.

C is the chuck for holding the stay bolt blank I to be cut. This stay bolt blank has a square head i in the present instance, which is adapted to a corresponding opening in the chuck. This chucr is mounted on a vertical shaft C, geared to a driving shaft C by gearings 0-0. [The cutter head in the resent instance has four die carriers E, each of these die carriers is mounted on a pivot 6 depending from the cutter head B.

B is an adjustable ring mounted in an annular groove in the cutter head, depending from this ring are pins 12' carrying blocks b which are adapted to radial slots 6' in the die carriers E, so -hat wher the ring B is shifted it will turn the die carriers E on their pivots and move the die E toward and from the center of the die carrier. The dies E have segmental threads cut in their periphery, as shown in Fig. 3, and cut the e seme t:ma a-retes Application mantra-5,191 s*ei--ia1 j1io. 54i;5a,

F iA NK A. d ne; n har nvented;

l at th thre ds is a viewof the finished stay Patented Apr. 9,1912.

nitrides portions -i. of the bolts. These QPIOJeGtmg from side ofthe ring B.

a tag 12 'nd projecting from the cutter head 1B area-bearingsb .and mounted .in g l having a head f, Sand on "theserew between the. two bearings bisianut f1, and gm the outside o'E one of thegbearingsg is a -nut f for adjusting the headlongitudinally and locking it the f pigs 1911' to which it isaadjusted Pivoted .to thefhead 0f theysqrew Fis a lever G, and

irpted'te .t ls. lever at g is 'a. link 9' which 13381 80 pivoted to theproject-in'g lug on theringBf, so-fllat on turning'the nuts f, f .the ring canbe turned. in one direction or either move toward or from the center of the head t-o accommodate the die to different size bolts.

b is a bracket projecting from the head "B and. mounted on a pivot pin it in-this bracket is an eccentric Hhaving a handle It. Mounte'don the eccentric is a strap n having apin n. ngaginga carrier N carrying the cutting tool m. This cutting tool is adwstably mounted-in the carrier N and is held'in position by a set 'screw m". The cutting tool m is adapted to slide in ways in the head B. The position of the cutter in respect to the threading dies can be regu' lated by backing off the set screw m, moving the cutter to the position desired. The cutter can be moved bodily into and out of cutting positionby operating the lever I) either automatically or by hand.

The cutter head B is preferably counterbalanced and a weight is attached to the counterbalance strap k, and this strap is connected to a cross head it from which extend rods It. The lower ends of these rods are attached to the cutter head, so that'the head is free to move on the vertical guides aa, and slightly over-balance the weight, so that it will feed itself after the cutters are once engaged, and when the cutter head reaches the chuck or stop it can be readily raised by the operator and the finished bolt removed and a new one substituted for it. The cutters cut a thread the entire length of the blank, Fig. 7, and when the thread i has been partially cut on the blank the cut 3 ter m is thrown into position by moving the I hand lever h, and this cutter removes the cutters-fare held in position by screws 'e=, 

